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<Title>Pareto Chart</Title>
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<p class="heading0">ChartDirector 7.0 (Java Edition)</p>
<p class="heading1">Pareto Chart</p>
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<img src="images/pareto.jpg" width='410' height='310'>
<br><br>
This example demonstrates the pareto chart style.<br><br>
A pareto chart is a bar chart with the data sorted in descending order, together with a line chart showing the same data in accumulated form. In the current example, the data is shown as both percentages and values on the two y-axes.<br><br>
The chart in this example is composed of two layers - a <a href="BarLayer.htm">BarLayer</a> created using <a href="XYChart.addBarLayer.htm">XYChart.addBarLayer</a>, and a <a href="LineLayer.htm">LineLayer</a> created using <a href="XYChart.addLineLayer.htm">XYChart.addLineLayer</a>.<br><br>
This example employs the <a href="ArrayMath.htm">ArrayMath</a> utility class for computing the accumulated line, obtaining the scaling factor between the two y-axes, and re-scaling the line data as percentages.<br><br>
The two y-axes are synchronized using <a href="Axis.syncAxis.htm">Axis.syncAxis</a>.
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<p class="heading1a">Source Code Listing</p>
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<b>[JSP Version]</b> jspdemo/pareto.jsp
<div class='codeblock'><code class='pre'>&lt;%@page import="ChartDirector.*, java.util.*" %&gt;
&lt;%
// The data for the chart
double[] data = {40, 15, 7, 5, 2};

// The labels for the chart
String[] labels = {"Hard Disk", "PCB", "Printer", "CDROM", "Keyboard"};

// In the pareto chart, the line data are just the accumulation of the raw data, scaled to a range
// of 0 - 100%
ArrayMath lineData = new ArrayMath(data);
lineData.acc();
double scaleFactor = lineData.max() / 100;
if (scaleFactor == 0) {
    // Avoid division by zero error for zero data
    scaleFactor = 1;
}
lineData.div2(scaleFactor);

// Create a XYChart object of size 480 x 300 pixels. Set background color to brushed silver, with a
// grey (bbbbbb) border and 2 pixel 3D raised effect. Use rounded corners. Enable soft drop shadow.
XYChart c = new XYChart(400, 300, Chart.brushedSilverColor(), 0xbbbbbb, 2);
c.setRoundedFrame();
c.setDropShadow();

// Add a title to the chart using 15 points Arial Italic. Set top/bottom margins to 12 pixels.
TextBox title = c.addTitle("Pareto Chart Demonstration", "Arial Italic", 15);
title.setMargin2(0, 0, 12, 12);

// Tentatively set the plotarea at (50, 40). Set the width to 100 pixels less than the chart width,
// and the height to 80 pixels less than the chart height. Use pale grey (f4f4f4) background,
// transparent border, and dark grey (444444) dotted grid lines.
c.setPlotArea(50, 40, c.getWidth() - 100, c.getHeight() - 80, 0xf4f4f4, -1, Chart.Transparent,
    c.dashLineColor(0x444444, Chart.DotLine));

// Add a line layer for the pareto line
LineLayer lineLayer = c.addLineLayer2();

// Add the pareto line using deep blue (0000ff) as the color, with circle symbols
lineLayer.addDataSet(lineData.result(), 0x0000ff).setDataSymbol(Chart.CircleShape, 9, 0x0000ff,
    0x0000ff);

// Set the line width to 2 pixel
lineLayer.setLineWidth(2);

// Bind the line layer to the secondary (right) y-axis.
lineLayer.setUseYAxis2();

// Tool tip for the line layer
lineLayer.setHTMLImageMap("", "", "title='Top {={x}+1} items: {value|2}%'");

// Add a multi-color bar layer using the given data.
BarLayer barLayer = c.addBarLayer3(data);

// Set soft lighting for the bars with light direction from the right
barLayer.setBorderColor(Chart.Transparent, Chart.softLighting(Chart.Right));

// Tool tip for the bar layer
barLayer.setHTMLImageMap("", "", "title='{xLabel}: {value} pieces'");

// Set the labels on the x axis.
c.xAxis().setLabels(labels);

// Set the secondary (right) y-axis scale as 0 - 100 with a tick every 20 units
c.yAxis2().setLinearScale(0, 100, 20);

// Set the format of the secondary (right) y-axis label to include a percentage sign
c.yAxis2().setLabelFormat("{value}%");

// Set the relationship between the two y-axes, which only differ by a scaling factor
c.yAxis().syncAxis(c.yAxis2(), scaleFactor);

// Set the format of the primary y-axis label foramt to show no decimal point
c.yAxis().setLabelFormat("{value|0}");

// Add a title to the primary y-axis
c.yAxis().setTitle("Frequency");

// Set all axes to transparent
c.xAxis().setColors(Chart.Transparent);
c.yAxis().setColors(Chart.Transparent);
c.yAxis2().setColors(Chart.Transparent);

// Adjust the plot area size, such that the bounding box (inclusive of axes) is 10 pixels from the
// left edge, just below the title, 10 pixels from the right edge, and 20 pixels from the bottom
// edge.
c.packPlotArea(10, title.getHeight(), c.getWidth() - 10, c.getHeight() - 20);

// Output the chart
WebChartViewer viewer = new WebChartViewer(request, "chart1");
viewer.setChart(c, Chart.SVG);

// Include tool tip for the chart
viewer.setImageMap(c.getHTMLImageMap(""));
%&gt;
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Pareto Chart&lt;/title&gt;
    &lt;!-- Include ChartDirector Javascript Library to support chart interactions --&gt;
    &lt;script type="text/javascript" src="cdjcv.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body style="margin:5px 0px 0px 5px"&gt;
    &lt;div style="font:bold 18pt verdana;"&gt;
        Pareto Chart
    &lt;/div&gt;
    &lt;hr style="border:solid 1px #000080; background:#000080" /&gt;
    &lt;div style="font:10pt verdana; margin-bottom:1.5em"&gt;
        &lt;a href="viewsource.jsp?file=&lt;%=request.getServletPath()%&gt;"&gt;View Source Code&lt;/a&gt;
    &lt;/div&gt;
    &lt;!-- ****** Here is the chart image ****** --&gt;
    &lt;%= viewer.renderHTML(response) %&gt;
&lt;/body&gt;
&lt;/html&gt;</code></div>
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